A standard PET/CT scanner is comprised of two different machines: An X-ray computed tomography scanner (CT), which gives information about your anatomy, and a Positron Emission Tomography scanner (PET) that provides information about how the body functions. Both of these work together to make the final images for doctors to review. As part of this research study the investigators would like to test a new scanner technology by evaluating the quality of the images obtained using this new PET system.